// C++ code
//

#define RED 12
#define YELLOW 11
#define GREEN 10

void setup()
{
  pinMode(RED, OUTPUT);
  pinMode(YELLOW, OUTPUT);
  pinMode(GREEN, OUTPUT);
  
  digitalWrite(RED, LOW);
  digitalWrite(YELLOW, LOW);
  digitalWrite(GREEN, LOW);
  Serial.begin(9600);
}

void loop()
{
  // Yield mode
  digitalWrite(RED, LOW);
  digitalWrite(YELLOW, HIGH);
  digitalWrite(GREEN, LOW);
  
  Serial.println(" Light Mode: Yield ");
  
  delay(1000);
  
  // Go mode
  digitalWrite(RED, LOW);
  digitalWrite(YELLOW, LOW);
  digitalWrite(GREEN, HIGH);
  
  Serial.println(" Light Mode: Go ");
  
  delay(2000);
  
  // Stop mode
  digitalWrite(RED, HIGH);
  digitalWrite(YELLOW, LOW);
  digitalWrite(GREEN, LOW);
  
  Serial.println(" Light Mode: Stop ");
  
  delay(2000);
}